Promosing results on the behavior of CuO/CuFe2O4 sputtered thin films as a sensing material under carbon dioxide atmospheres are presented in this article. More specifically, we report the effects of preparation parameters and microstructure of the sensing layer on the response to CO2. FEG-SEM images and XPS measurements revealed the two-stacked layers rearrangement of samples after air annealing as a key parameter in gas sensing test. The influence of the sensing layer thickness and the influence of Ag as an additive in the film on the response are also reported. The best response was obtained at the optimal operating temperature of 250 degrees C with a thin film deposited under low argon pressure and low target-to-substrate distance, reaching 40% towards 5000 ppm of CO2. (C) 2014 Elsevier B.V. All rights reserved.

Optical measurements performed through an iCCD camera equipped with an optical bandpass filter have been carried out on a pulsed dc glow discharge (GD) in order to study the spatial, temporal, and current dependency of the 1s5 (3P2) Ar metastable (Ar*) species. For the spatial and temporal study the pressure was held constant at 1hPa. The combination of the iCCD camera with the bandpass filter has allowed to acquire time-resolved images of the Ar* in a spatial region between the cathode and the anode. Those measurements have been performed through optical emission and absorption spectroscopy and have shown that the Ar* during the powering phase of the pulsed GD maximize in a spatial region close to the cathode (ca. 1mm) and that at the end of the pulsed GD, in the so-called afterglow region, the Ar* maximize in a spatial region far from the cathode (between 6–8mm). Then they reach their maximum intensity within the first 100μs and decay within 200–250μs, both after the end of the GD. It has also been observed that the Ar* species increase by increasing current.

Radiofrequency glow discharge coupled to optical emission spectroscopy has been used in pulsed mode in order to perform a detailed study of the measured temporal emission profiles for a wide range of copper transitions. Special attention has been paid to the early emission peak (or so-called pre-peak), observed at the beginning of the emission pulse profile. The effects of the important pulse parameters such as frequency, duty cycle, pulse width and power-off time, have been studied upon the Cu pulse emission profiles. The influence of discharge parameters, such as pressure and power, was studied as well.Results have shown that the intensity observed in the pre-peak can be 10 times as large as the plateau value for resonant lines and up to 5 times in case of transitions to the metastable levels. Increasing pressure or power increased the pre-peak intensity while its appearance in time changed. The pre-peak decreased when the discharge off-time was shorter than 100 mu s. According to such results, the presence of the pre-peak could be probably due to the lack of self-absorption during the first 50 mu s, and not to the ignition of the plasma. Under the selected operation conditions, the use of the pre-peak emission as analytical signals increases the linearity of calibration curves for resonant lines subjected to self-absorption at high concentrations. (C) 2010 Elsevier B.V.. All rights reserved.

Summary form only given. RF-Glow Discharge Optical Emission Spectrometry is a well established technique for direct compositional depth profiling (CDP) analysis of solid, conducting and non-conducting samples. The technique is based on sputtering surface atoms and their subsequent excitation in the discharge. The separation of sputtering and excitation makes the technique very little prone to matrix effects. The quantification procedure is based on the observation that emission yields depend strongly on the source impedance, which varies with the carrier gas density and the secondary electron emission yield of successively sputtered layers. Despite the apparent success, it lacks theoretical back-up and its extension to non-conductive materials is difficult.

设计了一种新的实验设备用于研究发射光谱的射频辉光中原子和离子的空间分布.通过测量沿等离子体羽流的不同原子和离子的发射强度来研究发生在等离子体内部的激发/离子化过程.该报导对辉光源与质谱联用的优化有较大意义,如离子提取的最佳位置.初步研究了连续和脉冲射频辉光光谱中等离子体的空间解析,尤其对影响发射信号的输入功率、压强及占空比等参数进行了评价.

We report the first direct gas phase observations of the electronic transitions, 2-DELTA-5/2, upsilon = 0 --> 2-PI-3/2, upsilon = 0 and 2-DELTA-5/2, upsilon = 0 --> 2-DELTA-3/2, upsilon = 1, in the NiH radical. NiH radical. From the observed transitions we obtained transition frequencies and electronic g factors.The observation of these electronic transitions by LMR has been possible only by employing the recently developed CO overtone laser. This work forms the first spectroscopic application of this new laser.

We report the first direct observation of the vibration-rotation spectrum of nickel-deuteride in its X 2Δ ground state by CO-Faraday-L.M.R. spectroscopy. A set of effective molecular parameters is given. We present first results on the vibration-rotation spectroscopy of NiH, employing a tunable diode laser spectrometer.

We report the first direct observation of the vibration-rotation spectrum of the diatomic chromium-hydride in its X6-SIGMA+ ground state by CO-Faraday laser magnetic resonance spectroscopy (LMR). Transitions of all four isotopomers attributed to the fundamental and the first hot band were detected. The spectra were analysed by a single least-squares fit using an effective Hamiltonian. A set of effective molecular parameters for the X6-SIGMA+ ground state is given.

We report the first spectroscopic observation of the tin hydride radical in the infrared spectral region. Vibration rotation transitions of the ten stable isotopic forms of SnH in the 2п3/2 component of its ground state were recorded with a CO-LMR-spectrometer. The isotopic structure, the ∧-doubling in the 2п3/2 substate and the hyperfine splitting due to the tin isotopes 115Sn, 117Sn and 119Sn have been resolved for the first time. A set of effective molecular parameters of the X 2п3/2 state is given.

We present the first spectroscopic observation of the nickel-hydride free radical in the infrared region in the gas phase. A set of vibrational rotational molecular constants for the electronic ground state is given.

A double modulation technique was developed for selective detection of open shell molecular ions. By employing this technique the vibration-rotation spectrum of DBr+ in its X 2Π3/2 ground state has been recorded. A new set of vibration-rotation molecular constants for both isotopic species D79Br+ and D81Br+ is given.

The absorption spectrum of the open-shell molecular ion SD+ in its X 3Σ- ground state has been observed by the mid-infrared L.M.R. technique for the first time. Pure vibrational rotational transitions were detected with 53 CO-laser-lines and 120 Zeeman components were assigned to four vibrational rotational bands of the SD+ ground state. The spectroscopic constants for the ground state were improved by at least an order of magnitude.